/**
 * Copyright (C) 2014-2015 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.linkedin.pinot.pql.parsers.pql2.ast;

import com.linkedin.pinot.common.request.BrokerRequest;
import java.util.List;


/**
 * Interface for AST nodes
 */
public interface AstNode {
  List<? extends AstNode> getChildren();

  boolean hasChildren();

  void addChild(AstNode childNode);

  void doneProcessingChildren();

  AstNode getParent();

  void setParent(AstNode parent);

  boolean hasParent();

  void updateBrokerRequest(BrokerRequest brokerRequest);

  void sendBrokerRequestUpdateToChildren(BrokerRequest brokerRequest);

  String toString(int indent);
}
